First published as part of AS L18-1963.Second edition 1971.AS L56 first published 1971.AS L57 first published 1971.AS L18-1971, AS L56-1971 and AS L57-1971 revised, amalgamated and redesignated AS 1504-1974.AS 1752 first published 1975.Second edition 1983.Second edition AS 1504-1983.AS 1504-1983 and AS 1752-1983 revised, amalgamated and redesignated in part as AS 4142.1-1993.